Creates `geo/object_merge` with the selected Null nodes such as `OUT_MyObject` #Houdini

create_object_merge.py

"""
- Select Null node(s)
- Run this script
- New geo(s) consists of `object_merge` which imports the selected Null node are created on /obj. The geo name would be the selected Null node name with removing prefix `OUT_`.
"""


def create_object_merge(selected_node):
    prefix = "OUT_"
    
    if selected_node.name() == prefix:
        print("create_object_merge error: the node name must not be `OUT_`")
        return
    
    new_geo_name = selected_node.name().replace(prefix, "")
    new_geo_path = "/obj/{}".format(new_geo_name)
    
    if hou.node(new_geo_path) is None:
        new_geo = hou.node("/obj").createNode("geo", new_geo_name)
        new_geo.moveToGoodPosition()
        new_object_merge = new_geo.createNode("object_merge", "object_merge1")
        param_object_path = hou.parm("{}/objpath1".format(new_object_merge.path()))
        param_object_path.set(selected_node.path())
        print("create_object_merge done: A new geo {} is created".format(new_geo.path()))
    else:
        print("Already exists: {}".format(new_geo_path))
    
    return


def main():
    selected_nodes = hou.selectedNodes()
    null_nodes = list(filter(lambda x: x.type().name().lower() == "null", selected_nodes))
    if not null_nodes:
        print("create_object_merge aborted: No Null node(s) are selected")
    else:
        [create_object_merge(x) for x in null_nodes]
    return


###
main()